The ET48450 DC rack power system is a compact, carrier-grade power conversion platform purpose-built for telecom central offices, mid-to-large data centers, and industrial facilities that demand always-on DC power. It operates from a three-phase 380VAC 63A/4P input and delivers a tightly regulated DC output adjustable from –43VDC to –58VDC, with nominal operation at –53.5VDC. Rated at 18kW maximum output, the system maintains conversion efficiency above 96% across a wide load range, directly contributing to lower energy bills and reduced cooling overhead.
Designed for high reliability and serviceability, the system adopts a fully modular architecture that supports up to six 3000W rectifier modules in N+1 or higher redundancy schemes. Each module is hot-swappable, weighs under 2kg, and integrates forced-air cooling with active power factor correction (≥0.99) and low total harmonic distortion (THDi ≤5%)—ensuring stable, grid-compliant operation and clean DC power delivery. The entire unit is housed in a space-efficient 5U chassis that fits seamlessly into standard 19-inch racks. Front-access hot-swap capability simplifies maintenance, while rear copper busbars provide a low-impedance, high-current wiring interface. The IP20-rated enclosure offers reliable protection against accidental contact and foreign object ingress.
Power distribution is intelligently managed through an integrated DC panel equipped with both LLVD and BLVD functionality. These features enable selective load shedding and help extend battery backup time during utility failures. An advanced system controller provides comprehensive monitoring and control, featuring 4 analog sensor inputs, 8 digital status inputs, and 8 dry-contact alarm relays that are fully programmable. For remote management, the system supports RS232, RS485, and SNMP interfaces, granting operators complete visibility and control over system status, alarms, and rectifier performance. On-site personnel can access real-time data and modify settings via the integrated front-panel LCD display without additional hardware.
Engineered to endure challenging operating environments, the ET48450 performs reliably over an ambient temperature range of –40°C to +65°C and withstands relative humidity from 5% to 95% (non-condensing). It delivers full output power without derating at altitudes up to 3000 meters. Combining modular scalability, flexible load management, and robust construction, the ET48450 provides a future-ready DC power infrastructure for applications where power continuity is critical and downtime carries significant operational and business consequences.
